Verse 1 is the G-D-Bb-C bit. The G#-G-C (sustained) -G#-Eb-G (sustained) bit is the first chorus. The bass cover guy throws in a couple Bb at the end of the two sustained bits for the transitions back. I like these and would keep them in a tab. So far in the song (verse 1 and first chorus) the bass line is played by keyboards.

Immediately following the first chorus, there is a fill based on the verse theme, and this is where the (stringed) bass comes in. I'm finding it hard to tell exactly what is being played, but this is how I have it:

(This is F hammer on G, C hammer on D, Bb hammer on C, and a Bb to drop back down into the verse.)

(I'm playing a 5 string in order to get the low D in the verse without having to tune the four string to drop D. In the bass cover, he played the D at A5, an octave up from the recording, which is fine, rather than tune to drop D. If I were playing it on a four string, I would use drop D tuning.)